Windows8 disk space issue

My computer system is windows8. When I try to download something or just run some programs, a warning would show up and said that I have low disk space.
The best effective way to clear my disk space/ How can I clear my disk space? I also wonder a simple disk defragmentation could do something. Many thanks.
Ask: Need any Disk cleaner?
(Do I need to use a disk cleaner like Colorful Disk Clean[http(ignore)//apps.microsoft.com/windows/en-us/app/colorful-disk-clean/2972d7f6-b902-44d1-999a-8f4e49db8923]?
This program looks cheap and useful, or u guys have any other suggestions?)